ronrenay
ronrenay
4 posts
Joined July 2018

belled case powder drops

I am seeing differing results when dropping powder on a belled vs non belled case anywhere from 0.06- 0.09 more using freshly sized non belled case.

Makes it inconvenient when developing loads and changing PD amts often to use a fesh case everytime. Once drop is adjusted to fresh case and you pour out powder to measure now you are stuck with a belled case which will invoke sig lower drop amt. This is a problem when trying to chase loads using .1 increments, esp when getting near the max.
ronrenay
ronrenay
4 posts
Joined July 2018

RE: belled case powder drops

In case it matters, I am using small powder bar for loading approx 4.2/4.3gr of Winchester 231 in 9mm.
rmoser38
rmoser38
58 posts
Joined October 2008

RE: belled case powder drops

Sounds like you are belling the case to much. You should not be going more than 20 thousandths larger than the original case size according to the manual. Page 12 Figure 22.
ronrenay
ronrenay
4 posts
Joined July 2018

RE: belled case powder drops

I have checked case diameter prior to belling and after and avg 0.18 greater with seated bullet. I think my problem is running fresh/primed case through PD then weighing powder and then making adj using PB adj hex screw. Then dump powder back in PM container. Then when I get drop amt correct I have already belled cases to fill and they fill lighter than the first fill with fresh/primer case.

Maybe filling belled case twice is a bad idea, but I would have to remove deprime pin and resize already primed cases in order to have them properly fill with fresh sized/primed case.

Ex: PD set to 4.2gr.
1. Run station 2 with freshly sized/primed case
2. Pour powder onto scale and weigh to make sure 4.2 is being dispensed. I get result of 4.21
3. Dump powder off scale back into PM
4. Run station 2 again using same (now belled) case and weight drop. I get result 4.14 (.6 less than original drop weight with original station 2 run).

This is repeatable to have belled case drops weigh 0.05 to 0.07 less than non belled cases.
Drop weights don't vary much (approx 0.02 - 0.03) when run sequentially with either all belled or all non belled cases.
jforwel
jforwel
76 posts
Joined November 2007

RE: belled case powder drops

Plus or minus .10 grain is normal for most powder measures and I've always found the Dillon measure to be very consistent.
ronrenay
ronrenay
4 posts
Joined July 2018

RE: belled case powder drops

Ok, called Dillon and they recommended that I do the following:
1. Tap on PM with knucke to settle powder upon initial fill.
2. With handle up and fully forward (in priming position), turn wing nut of fail safe rod until fully compressed, then back off 1 complete turn.

I will try this and see if it helps belled case drop amt to match non belled case drop amt.